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Chapter 4: Troubleshooting
153
Undetermined problems
If the diagnostic test may not identify which adapter or device failed, which installed devices are
incorrect, whether a short circuit is suspected, or whether the system is inoperative. Use these
procedures to isolate the failing FRU (do not isolate a non-defective FRU).
Note: Verify that all attached devices are supported by the notebook.
Note: Verify that the power supply being used at the time of the failure is
operating correctly. (See “Testing the power system” on page 138.):
To isolate a failing FRU:
1 Turn off the notebook.
2 Visually check FRU parts for damage. If you identify any damage, replace the FRU.
3 Remove or disconnect all of the following devices:
❑ Non-Acer devices
❑ Printer, mouse, and other external devices
❑ Battery pack
❑ Hard disk drive(s)
❑ SO-DIMM
❑ Optical drive
❑ PC Cards and Type 54 ExpressCards
4 Turn on the notebook.
5 Determine if the problem has changed.
❑ If the problem does not recur, reconnect the removed devices one at a time
until you find the failing FRU.
❑ If the problem does recur, replace the following FRUs one at a time:
❑ System board
❑ LCD assembly
Important: Do not replace a non-defective FRU.